BACTERIOLOGY OF MILK IN ITS RELATION TO DISEASE 459 



TABLE SHOWING THE RESULTS OF FEEDING DURING JULY AND AUGUST, 1901, 

 IN TENEMENT HOUSES, OF 112 BOTTLE-FED INFANTS UNDER 1 YEAR OF AGE, 

 AND OF 47 BOTTLE-FED INFANTS BETWEEN 1 AND 2 YEARS OF AGE WITH MILK 

 FROM DIFFERENT SOURCES, AND THE NUMBER OF BACTERIA PRESENT IN THE 

 MILK. 



There is nothing in the observations to show that fairly fresh milk 

 from healthy cows, living under good hygienic conditions and con- 

 taining, on some days, when delivered, as many as 200,000 bacteria 

 per cubic centimetre, had any bacteria or any products due to bacteria 

 that remained deleterious after the milk was heated to near the boiling 

 point. 



On the other hand, it is possible that certain varieties of bacteria 

 may, under conditions that are unsanitary, find entrance to milk and 

 survive moderate heat or may develop poisonous products resistant 

 to heat in sufficient amount to be harmful, even when they have accu- 

 mulated to less than 200,000 per cubic centimetre. 



Turning now to the results of feeding with milk which has been 

 heated and which before sterilization contained from 1,000,000 to 



1 This infant died from enteritis and toxaemia. 



2 This infant died of pneumonia. There had been no severe intestinal disorder noted. 



3 One of the four had pertussis, the remaining three died from uncomplicated enteritis. 



